UBUNTU-CVE-2026-92289

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Source

https://ubuntu.com/security/CVE-2026-92289

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-92289

Upstream

CVE-2026-92289

Published

2026-09-25T01:16:00Z

Modified

2026-10-01T00:22:36Z

Severity

9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

Lemonldap::NG::Portal versions from 2.23.0 before 2.23.4 for Perl allow a PKCE bypass for public Relying Parties in "PKCE or secret" mode because checkEndPointAuthenticationCredentials does not verify the client secret. With oidcRPMetaDataOptionsRequirePKCE set to 2, the authorization endpoint issues a code even when the request carries no code_challenge, and token() admits the exchange as long as a challenge was stored or an authentication method was returned for the caller. checkEndPointAuthenticationCredentials() skips the secret comparison for a Relying Party marked public and still returns the method deduced from the request, so any Basic or form credential satisfies the secret branch. validatePKCEChallenge() then passes, because neither a challenge nor a verifier is present. An attacker who intercepts an authorization code issued to a public Relying Party can exchange it for the user's access, ID and refresh tokens by replaying the client_id with an arbitrary secret, which is the attack PKCE prevents. Dynamic client registration creates every Relying Party in this mode.

References

Affected packages

Ubuntu:16.04:LTS

lemonldap-ng

Package

Name: lemonldap-ng
Purl: pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.3.3-1

1.4.6-1

1.4.6-2

1.4.6-3

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "1.4.6-3"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "1.4.6-3"
        },
        {
            "binary_name":  "liblemonldap-ng-conf-perl",
            "binary_version":  "1.4.6-3"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "1.4.6-3"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "1.4.6-3"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "1.4.6-3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"

Ubuntu:18.04:LTS

lemonldap-ng

Package

Name: lemonldap-ng
Purl: pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.9.10-1

1.9.13-2

1.9.14-1

1.9.15-1

1.9.16-2

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "lemonldap-ng-fastcgi-server",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "lemonldap-ng-handler",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "1.9.16-2"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "1.9.16-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"

Ubuntu:20.04:LTS

lemonldap-ng

Package

Name: lemonldap-ng
Purl: pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.0.5+ds-2

2.0.6+ds-2

2.0.7+ds-2

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "lemonldap-ng-fastcgi-server",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "lemonldap-ng-handler",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "lemonldap-ng-uwsgi-app",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "2.0.7+ds-2"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "2.0.7+ds-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"

Ubuntu:22.04:LTS

lemonldap-ng

Package

Name: lemonldap-ng
Purl: pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.0.11+ds-4

2.0.13+ds-3

2.0.13+ds-3ubuntu1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "lemonldap-ng-fastcgi-server",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "lemonldap-ng-handler",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "lemonldap-ng-uwsgi-app",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "2.0.13+ds-3ubuntu1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"

Ubuntu:24.04:LTS

lemonldap-ng

Package

Name: lemonldap-ng
Purl: pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.16.2+ds-1

2.17.1+ds-1

2.17.2+ds-1

2.17.2+ds-2

2.18.1+ds-1

2.18.2+ds-1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-fastcgi-server",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-handler",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-uwsgi-app",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "2.18.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-ssoaas-apache-client-perl",
            "binary_version":  "2.18.2+ds-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"

Ubuntu:26.04:LTS

lemonldap-ng

Package

Name: lemonldap-ng
Purl: pkg:deb/ubuntu/lemonldap-ng?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.21.0+ds-3

2.22.0+ds-2

2.22.1+ds-1

2.22.2+ds-1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "lemonldap-ng",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-fastcgi-server",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-handler",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "lemonldap-ng-uwsgi-app",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-common-perl",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-handler-perl",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-manager-perl",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-portal-perl",
            "binary_version":  "2.22.2+ds-1"
        },
        {
            "binary_name":  "liblemonldap-ng-ssoaas-apache-client-perl",
            "binary_version":  "2.22.2+ds-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-92289.json"